The 49ers' game plan called for Thunder and Lightning. The forecast apparently didn't hit Lambeau Field, after all.

In his first start at running back, Brian Westbrookwas held to nine carries for 31 yards, and rookie Anthony Dixonwas good for just 33 yards in his nine carries, which goes a long way toward explaining the 49ers' 34-16 loss to the Packers.

So begins life after Pro Bowl running back Frank Gore, who is out for the season with a fractured hip.

"We just didn't get things going early," Westbrook said. "We've got to do a better job when we have opportunities."

They didn't, especially in the red zone.

On 1st-and-goal from the 2 in the second quarter, Dixon was stopped for no gain. Same thing happened to Westbrook on 2nd-and-goal from the 5 in the third quarter.

Both drives ended with field goals, not touchdowns. That about summed up the offense's day.

"Some Sundays things are just clicking, and sometimes it isn't," quarterback Troy Smithsaid.

No fair: The 49ers' defense jumped offside six times, but 49ers head coach Mike Singletarysaid Packers quarterback Aaron Rodgersdid more than hard-count the 49ers into the neutral zone.

The doozy came when Rodgers used a free play to toss a 57-yard touchdown to Greg Jenningsin the second quarter.

"I alerted the referee that Rodgers would have movements, and was moving his body away from the center," Singletary said. "That was causing our guys to jump early. After that, I think we had only one other call."

Man down: Outside linebacker Ahmad Brooksmade his first start in two seasons with the 49ers, all because Parys Haralson(ankle) was a game-day scratch.

Brooks essentially split the snaps with Travis LaBoy, with each playing one series at a time. Manny Lawsonplayed 55 of 68 snaps.

Brooks had two sacks and LaBoy had one.

"I think anytime you get consecutive plays, you get into a rhythm, so that definitely helped," LaBoy said.

Cold one: Game-time temperature was 26 degrees - the 49ers' coldest game in at least 10 years, and two ticks below their 2001-season playoff trip to Green Bay.

Haralson and safety Reggie Smithwere the only defensive starters to sport long sleeves.

Big play: Vernon Davis' 66-yard touchdown catch was the team's longest play from scrimmage, the final 45 coming after he ducked inside Packers safety Nick Collins.

Briefly: Inside linebacker Takeo Spikesled the 49ers with a career-high 17 tackles. ... Undrafted rookie Chris Maragoshad one special-teams tackle in his NFL debut. ... Third-string running back DeShawn Wynninjured his ankle in his 49ers debut and didn't finish the game against his former team. ... Cornerbacks Tarell Brown and Nate Clementsplayed through knee contusions. ... The 49ers have lost eight straight games at Lambeau Field, and 13 of 14 overall to the Packers. ... David Baasstarted at center after missing most of the week with a concussion.